| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.19 24/58] x86/entry: Increase entry_stack size to a full page | Date | Tue, 14 Jul 2020 20:43:57 +0200 |
| |
From: Peter Zijlstra <peterz@infradead.org>
[ Upstream commit c7aadc09321d8f9a1d3bd1e6d8a47222ecddf6c5 ]
Marco crashed in bad_iret with a Clang11/KCSAN build due to overflowing the stack. Now that we run C code on it, expand it to a full page.
Suggested-by: Andy Lutomirski <luto@amacapital.net> Reported-by: Marco Elver <elver@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Lai Jiangshan <jiangshanlai@gmail.com> Tested-by: Marco Elver <elver@google.com> Link: https://lkml.kernel.org/r/20200618144801.819246178@infradead.org Signed-off-by: Sasha Levin <sashal@kernel.org> --- arch/x86/include/asm/processor.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index efb44bd3a7140..0f750e7b24071 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -336,7 +336,7 @@ struct x86_hw_tss { #define INVALID_IO_BITMAP_OFFSET 0x8000 struct entry_stack { - unsigned long words[64]; + char stack[PAGE_SIZE]; }; struct entry_stack_page { -- 2.25.1
|